Grindstone-dresser.



PATBNTED DEC. 22. 1903.

M. GAI'R.

GRINDSTONE DRESSER.

n APPLICATION rum) MAY 21, 1903.

:10 MODEL.

/ IVE/VTOR In: Nonms Pzrcks co PNOTO-LITHQ, WASHINGTON, o. n.

PATBNTED DEC; 22. 1903'.

M. GA-I-R.

- GRINDSTONE DRESSER.

APPLICATION FILED MAY 27, 1903.

KSHEEIS-SHBET 21 no" MODEL.

' INVENTOR "v I: Atl0mzy- JTNESSES' UNITED STATES MARK GAIR, OF

Patented December 22, 1903.

PATENT Option.

GRlNDSTONE-DRESSER.

SPECIFICATION forming part of Letters Patent No. 747,883, dated December 22, 1903.

Application filed May'27, 1903. Serial No. 159.037. (No model.)

.To all whom it may concern:

Be it known that I, MARK GAIR, a resident of Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Grindstone- Dressers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and In the accompanying drawings, Figure l is a plan view illustrating my improvements. Fig. 2 is a side view,'and Fig. 3' is a transverse sectional view.

1 represents the base-plate, to be fastened to the frame of a grindstone by means of.

suitable clamps provided for the purpose and on this base-plate 1 a raised track 2 is made integral and provided with beveled or inwardly-inclined side edges, as clearly shown in Fig. 3. On this track the slide-plate 4 is mounted and has secured to its under face at both ends by means of screws 5 beveled cleats or gibs 6 to run against the beveled or inclined side edges of the track to insure the retention of the side plate thereon. This slide-plate 4 is provided at its center with a downward ly-projecting lug 7, having a screwthreaded opening therein to receive a screw 8, having rotary hearings in the ends of the track-frame and base-plate and made angular at one end for the reception of a suitable tool to turn the screw and move the slideplate longitudinally on the track.

The slide-plate 4 near one end is provided with a pin 9, on which a plate 10 is pivotally mounted, and this pivot-plate 10 is made with a circular enlargement at one end and has a rearwardly-tapering extension 11, in

which a screw 12 is mounted and adapted to enter any of a series of threaded sockets 13 in the slide-plate to secure, the pivot-plate at any angle desired. The circular enlarged portionof pivot-plate 10, which is concentric to the-pivotalpoint, is made with a V-shaped groove at its center running longitudinally of the pivot-plate,"and a cap-plate 14 is secured on the circularenlarged portion of the pivotp'late and has a corresponding V shaped groove to receive the angular portion of a.

spindle I6. This spindle 16 is round at both ends and screw-threaded at its inner end and passed through a perforated lug 17 on pivotplate 10, and adj listing-nuts 18 and 19 are located on the threaded portion of the spindle on opposite sides of lug 17 to adjust the spindle longitudinally and clamp it at any adjustment.

The outer end of the spindle adords a smooth bearing for a hollow rotary cutter 20,

and the spindle has an annular groove 21 to receive pins 22 in the cutter for preventing longitudinal displacement of the latter.

The cutting edge of cutter 20 is flared outward, and the internal bore of the cutting end thereof is at an angle diiferent from the outer face, while the outer end is perfectly fiat or smooth, so that the cutter is self-sharpening, for as it wears away the bevel of the tool will always present a sharp cutting edge.

A great many slight changes might be made in the general form and arrangement of the parts described without departing from my invention, and hence I would have it understood that I do not confine myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described myinvention, what I claim as new, and desire to secure byLetters Patent, is

1. In a millstone-dresser, the combination with a base-plate, a slide-plate, and a plate pivoted on the slide-plate, of a spindle mounted to slidelongitudiually on the pivoted plate, a threaded shank projecting from one end of said spindle, a perforated lug on the pivoted plate, through which the threaded shank passes, nuts on the shank at respective sides of said lug, and a revoluble cutter mounted on the forward end of said spindle.

2. In a millstoue-dresser, the combination with a base and a plate mounted to slide thereon, of a plate pivoted to the slide-plate and having a V-shaped groove in its upper face, a peforated lug on said pivoted plate in rear of said groove, a cap mounted on the pivoted plate and having an inverted V- shaped groove, an angular spindle confined in the V-shaped grooves of the pivoted plate and cap, a cutter mounted on the forward end of the spindle, a threaded shank projecting from the spindle and passing through the perforated lug on the pivoted plate, and nuts on said shank at respective sides of said lug.

3. In a grindstone-dresser, the combination with a base-plate to be secured on the frame of a grindstone, a sliding plate on the baseplate, and a screw to move said slide-plate, of a plate pivoted on said slide-plate having a circular enlargement concentric with the pivotal point, and a contracted extension, a screw in said extension to enter any of a series of threaded sockets in the slide-plate to secure the pivoted plate at various angles, a circular cap-plate secured on the circular enlarged portion of the pivoted plate, a spindle angular throughout a portion of its length, and said circular enlarged portion of the pivoted plate and the cap-plate having opposite V-shaped grooves to receive the angular portion of the spindle, a perforated lug, on the slide-plate through which the screw-threaded inner end of the spindle is passed, nuts on the spindle on opposite sides of the lug to adjust the spindle longitudinally, and a rotary cutter on the opposite end of the spindle.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' MARK GAIR. Witnesses:

THOS. SOMMERVILLE, HENRY BooKsTED. 

